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Chemistry MCQs

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Practice the essential concepts of matter, atomic structure, chemical reactions, bonding and everyday applications of chemistry.

Atomic StructureChemical BondingReactionsOrganic Chemistry
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41
Medium nts Uploaded: 07 Aug 2026

What is the electronic configuration of Neon (2-8-2)?

  • A 2-2-8
  • B 2-8
  • C 2-8-8
  • D 2-6-2
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Correct Answer: Option C — 2-8-8
Explanation: Neon has an atomic number of 10 and an electronic configuration of 2-8, meaning two electrons occupy the first shell and eight electrons fill the second shell completely, giving it a stable noble gas structure.
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42
Medium fpsc ppsc nts Uploaded: 05 Aug 2026

What gas is produced when calcium carbonate is heated strongly in thermal decomposition?

  • A Oxygen
  • B Sulfur dioxide
  • C Carbon dioxide
  • D Carbon monoxide
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Correct Answer: Option C — Carbon dioxide
Explanation: Heating calcium carbonate strongly causes thermal decomposition producing calcium oxide quicklime and carbon dioxide gas a reaction widely used in cement production and lime kilns.
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43
Medium fpsc ppsc nts Uploaded: 14 Jul 2026

Which type of chemical reaction involves a substance combining with oxygen to release energy?

  • A Reduction
  • B Oxidation
  • C Neutralisation
  • D Decomposition
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Correct Answer: Option B — Oxidation
Explanation: Oxidation involves the combination of a substance with oxygen releasing energy often as heat and light as seen in combustion reactions such as burning wood or fuels.
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44
Medium fpsc ppsc nts Uploaded: 14 Jul 2026

Which type of hydrocarbon contains at least one carbon to carbon double bond?

  • A Alkane
  • B Alkyne
  • C Alkene
  • D Arene
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Correct Answer: Option C — Alkene
Explanation: Alkenes are unsaturated hydrocarbons containing at least one carbon to carbon double bond making them more reactive than alkanes and important in polymer production.
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45
Medium nts Uploaded: 07 Aug 2026

Which halogen is a liquid at room temperature?

  • A Iodine
  • B Fluorine
  • C Chlorine
  • D Bromine
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Correct Answer: Option D — Bromine
Explanation: Bromine is the only halogen that exists as a liquid at room temperature, with a reddish-brown color and pungent odor. It is used in flame retardants, pharmaceuticals, and various industrial chemical processes.
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46
Medium nts Uploaded: 06 Aug 2026

Which type of chemical bond is found in metals?

  • A Ionic bond
  • B Covalent bond
  • C Metallic bond
  • D Hydrogen bond
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Correct Answer: Option C — Metallic bond
Explanation: Metallic bonding occurs when metal atoms share a 'sea' of delocalized electrons that move freely among positively charged metal ions. This structure explains why metals conduct electricity and heat efficiently and are malleable.
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47
Medium fpsc ppsc nts Uploaded: 14 Jul 2026

What is the chemical formula for sulfur dioxide a gas that causes acid rain?

  • A SO3
  • B S2O
  • C SO
  • D SO2
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Correct Answer: Option D — SO2
Explanation: Sulfur dioxide SO2 is produced by burning fossil fuels containing sulfur and when it reacts with atmospheric moisture it forms sulfurous and sulfuric acid contributing to acid rain.
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48
Medium fpsc ppsc nts Uploaded: 14 Jul 2026

What is the chemical formula for glucose, the primary energy source for cells?

  • A C6H10O5
  • B C12H22O11
  • C C6H12O6
  • D C6H6O6
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Correct Answer: Option C — C6H12O6
Explanation: Glucose has the chemical formula C6H12O6 and is a monosaccharide sugar that serves as the primary energy source for cellular respiration in living organisms.
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49
Medium nts Uploaded: 07 Aug 2026

Which element is known for forming the largest number of compounds?

  • A Hydrogen
  • B Oxygen
  • C Carbon
  • D Nitrogen
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Correct Answer: Option C — Carbon
Explanation: Carbon forms the largest number of compounds among all elements due to its ability to bond with itself and other elements in chains, rings, and branched structures, forming the foundation of organic chemistry.
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50
Medium nts Uploaded: 07 Aug 2026

What is the chemical formula for glucose?

  • A C6H12O6
  • B C12H22O11
  • C C6H6O6
  • D C6H10O5
Permalink
Correct Answer: Option A — C6H12O6
Explanation: Glucose has the chemical formula C6H12O6, making it a simple sugar and vital energy source for living organisms. It is produced during photosynthesis and broken down in cellular respiration to release energy.
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